Ring Gear and Handle
I spent some time making the carrier pins for each layer of planets and the ring gear. My gears are set up in a 64/16/32 ratio (Ring, Planet, Sun). I’m going to layer 3 of these stages together to achieve a total reduction ratio of 8:1
The carrier pins are set up on my sun gear. I have designed small raised sections to prevent excessive plastic-on-plastic rubbing, these raised sections also give lubericant a place to sit, reducing overall friction which is critcal for a backdriven gearbox like this.
From experience, a little bit of friction at the very end stages will result in a very large effect, often making the system completely undrivable. This is because the 8:1 total reduction ratio means for example 3N of friction in the last stage will translate to 24N of additional force needed to start spinning
The ring gear is split to allow the herringbone gears to actually be assembled. (I’m not letting my lack of DFA getting the better of me again!)
Next I will work on a handle and gearbox lock mechanism, if i have time i may start on overall housing design and/or propellers